Erratic Or Hunting Shifts

Perform ROAD TEST under PERFORMANCE TESTS in FORD 4R100 OVERHAUL article. Perform TORQUE CONVERTOR ENGAGEMENT TEST  under DIAGNOSIS & TESTING. Perform QUICK TEST . Record DTCs. Perform TEST A , TEST B , TEST C  and TEST D  under SYSTEM TESTS. Repair as necessary. Clear DTCs and perform TRANSMISSION DRIVE CYCLE TEST  under DIAGNOSIS & TESTING. Repeat QUICK TEST  and ensure DTCs are not present.